Flash evaporation device and carbonate solution decarburization method

Abstract

The invention relates to the technical field of equipment safety, and discloses a flash evaporation device and a decarburization method of a carbonate solution. The flash evaporation equipment comprises a flash evaporation tank and a feeding port formed in the top of the flash evaporation tank, the feeding port comprises a cone (2) and a stirring device which is arranged in the cone and provided with a spiral blade, a reinforcing rib plate (1) is arranged on the outer side of the cone (2), a supporting pipe (6) is arranged on a central shaft of the cone (2), and the supporting pipe (6) is connected with the conical body (2). An inclined flow guide plate (3) and a vertical flow guide plate (4) are arranged between the cone (2) and the supporting pipe (6), and the top of the cone (2) is connected with a flange (7) through a connecting pipe (5). According to the flash evaporation equipment, serious damage of high-speed gas-liquid two-phase flow to the steel plate is avoided, and meanwhile the problem of strong vibration of the equipment is solved.

Description

Technical Field

[0001] The invention relates to the technical field of equipment safety, and in particular to a flash evaporation device and a method for decarbonizing a carbonate solution. Background Art

[0002] In the decarbonization unit, the flash device is mainly used to flash regenerate the carbonate solution that has absorbed carbon dioxide. In the flash tank, the carbon dioxide absorbed by the carbonate will be released as the pressure is reduced, thus separating from the carbonate solution. After the carbonate solution has desorbed carbon dioxide, it returns to the absorption tower to continue absorbing carbon dioxide. In the current flash process, due to the pressure reduction during the desorption process, the volume of the flashed vapor-liquid mixture expands to about five times the original volume, and the flash tank will vibrate violently. Under continuous production conditions, the equipment near the flash steam outlet is easily punctured due to the continuous impact force, which seriously affects normal production. Summary of the invention

[0003] The purpose of the present invention is to overcome the problems of serious damage to steel plates and strong vibration of equipment caused by high-speed gas-liquid two-phase flow in the flash evaporation device in the prior art, and to provide a flash evaporation device and a decarbonization method for a carbonate solution. The flash evaporation device allows the material to be diverted through a spiral flow, which not only releases huge energy through rotation, but also expands the contact area between the liquid and the gas, allowing the liquid to fully flash, thereby avoiding serious damage to the steel plates caused by the high-speed gas-liquid two-phase flow in the flash evaporation device, and at the same time solving the problem of strong vibration of the equipment.

[0004] In order to achieve the above-mentioned objectives, the first aspect of the present invention provides a flash evaporation device, comprising a flash evaporation tank and a feed port arranged at the top of the flash evaporation tank, the feed port comprising a cone and a stirring device with spiral blades arranged inside the cone, a reinforcing rib plate is arranged on the outer side of the cone, a support pipe is arranged on the central axis of the cone, an inclined guide plate and a vertical guide plate are arranged between the cone and the support pipe, and a flange is connected at the top of the cone through a connecting pipe.

[0005] Preferably, a reinforcement ring is provided on the outer side of the connecting pipe.

[0006] Preferably, the inclined guide plate and the vertical guide plate are arranged at intervals.

[0007] Preferably, the number of the inclined guide plates is 3-30.

[0008] Preferably, the angle between the inclined guide plate and the flash tank is 5-45°.

[0009] Preferably, the number of the vertical guide plates is 3-30.

[0010] Preferably, the number of the reinforcing rib plates is 3-30.

[0011] Preferably, the number of the reinforcing rib plates, the inclined guide plates and the vertical guide plates is equal and they are arranged at intervals.

[0012] Preferably, the inclined guide plate is in the shape of a right-angled trapezoid or a fan.

[0013] Preferably, the vertical guide plate is in the shape of a rectangle or a square.

[0014] A second aspect of the present invention provides a method for decarbonizing a carbonate solution, the method comprising: adding the carbonate solution that has absorbed carbon dioxide into the above-mentioned flash evaporation equipment for decarbonization treatment.

[0015] Through the above technical solution, the liquid enters the flash evaporation equipment through the spiral blades, and the vertical guide plates and inclined guide plates designed with special shapes and angles cause the gas-liquid two-phase flow to rotate and disperse, which not only releases the huge energy rotationally, but also expands the contact area between the liquid and the gas, so that the liquid can be fully flashed, thereby avoiding serious damage to the steel plate due to the high-speed gas-liquid two-phase flow in the flash evaporation tank, and also solving the problem of strong vibration of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the flash evaporation equipment described in the present invention.

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the feed port of the flash evaporation equipment described in the present invention.

[0018] Description of Reference Numerals

[0019] 1. Reinforcement rib plate; 2. Cone; 3. Inclined guide plate; 4. Vertical guide plate; 5. Connecting pipe; 6. Support pipe; 7. Connecting flange; 8. Reinforcement ring. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0021] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0022] like Figure 1As shown, the flash evaporation equipment described in the present invention includes a flash evaporation tank and a feed port arranged at the top of the flash evaporation tank, the feed port includes a cone 2 and a stirring device with spiral blades arranged inside the cone, a reinforcing rib plate 1 is arranged on the outside of the cone 2, a support pipe 6 is arranged on the central axis of the cone 2, an inclined guide plate 3 and a vertical guide plate 4 are arranged between the cone 2 and the support pipe 6, and a flange 7 is connected to the top of the cone 2 through a pipe 5. According to the flash evaporation equipment described in the present invention, the liquid is diverted by the spiral blades, and the vertical guide plates and inclined guide plates designed with special shapes and angles make the gas-liquid two-phase flow rotate and disperse, and release the huge energy in rotation to avoid the equipment being punctured due to continuous impact force, and even affect normal production, solving the problem of strong vibration of the equipment; and expanding the contact area between the liquid and the gas to fully flash the liquid.

[0023] In the flash evaporation equipment described in the present invention, the flash evaporation tank is a conventional device in the art, and the embodiments of the present invention will not be described in detail. The number of feed ports arranged at the top of the flash evaporation tank can be more than one, and specifically, for example, it can be one, two, three, four or more. Taking into account the efficiency and cost of flash evaporation, the number of feed ports is preferably two. The ratio of the caliber of the feed port to the width of the flash evaporation tank can be 1: (8-15), preferably 1: (10-12), and specifically, for example, it can be 1: 8, 1: 10, 1: 12, 1: 14 or 1: 15. The caliber diameter of the feed port can be DN100-DN900, and preferably DN300-DN400. The width of the flash evaporation tank can be 1000mm-10000mm, and preferably 3000mm-5000mm.

[0024] In the flash evaporation equipment of the present invention, in order to ensure the strength and rigidity of the feed port and improve the impact resistance, the material of the reinforcing rib plate 1 is preferably at least one of carbon fiber, steel bar, and glass fiber, the shape of the reinforcing rib plate 1 is preferably trapezoidal, the upper bottom of the reinforcing rib plate 1 is preferably 20mm-100mm, the lower bottom of the reinforcing rib plate 1 is preferably 50mm-200mm, and the height of the reinforcing rib plate 1 is preferably 50mm-300mm. The number of the reinforcing rib plates 1 can be 3-30 pieces, preferably 6-10 pieces. The reinforcing rib plates 1 can be arranged with the central axis of the cone 2 as the symmetry center.

[0025] In the flash evaporation device of the present invention, the shape of the cone 2 can be a truncated cone. The ratio of the diameter of the upper surface, the diameter of the lower surface and the height of the cone 2 can be 1:1:1:5, preferably 1:2. The diameter of the upper surface of the cone 2 can be 100mm-900mm, preferably 300mm-400mm. The diameter of the lower surface of the cone 2 can be 200mm-1000mm, preferably 300mm-500mm. The height of the cone 2 can be 100mm-500mm, preferably 200mm-400mm.

[0026] In the flash evaporation device of the present invention, in order to ensure the rotation and dispersion of the gas-liquid two-phase flow, the inclined guide plates 3 and the vertical guide plates 4 are preferably arranged at intervals. The angle between adjacent inclined guide plates 3 and vertical guide plates 4 can be 6-60°, preferably 18-30°.

[0027] In the flash evaporation equipment of the present invention, the number of the inclined guide plates 3 can be 3-30, preferably 6-10. The shape of the inclined guide plates 3 is a right-angled trapezoid or a fan. The length of the inclined guide plates 3 can be 20mm-200mm, preferably 50mm-100mm. The width of the inclined guide plates 3 can be 20mm-200mm, preferably 50mm-100mm. The angle between the inclined guide plates 3 and the flash evaporation tank can be 5-45°, preferably 10-30°. The inclined guide plates 3 can be arranged with the central axis of the cone 2 as the center of symmetry.

[0028] In the flash evaporation device of the present invention, the number of the vertical guide plates 4 can be 3-30, preferably 6-10. The shape of the vertical guide plates 4 is rectangular or square. The length of the vertical guide plates 4 can be 20mm-200mm, preferably 50mm-100mm. The vertical guide plates 4 can be arranged with the central axis of the cone 2 as the symmetric center.

[0029] In the flash evaporation equipment described in the present invention, the number of the reinforcing ribs 1, the inclined guide plates 3 and the vertical guide plates 4 is equal and arranged at intervals. The ratio of the angle between the adjacent reinforcing ribs 1 and the inclined guide plates 3 to the angle between the adjacent reinforcing ribs 1 and the vertical guide plates 4 can be 1:(0.1-10), preferably 1:(0.5-2). The angle between the adjacent reinforcing ribs 1 and the inclined guide plates 3 can be 6-60°, preferably 18-30°. The angle between the adjacent reinforcing ribs 1 and the vertical guide plates 4 can be 6-60°, preferably 18-30°.

[0030] In the flash evaporation device of the present invention, the shape of the pipe 5 can be a round tube. The outer diameter of the pipe 5 can be DN100-DN900, preferably DN300-DN400. The inner diameter of the pipe 5 can be DN80-DN90. The outer diameter of the pipe 5, the diameter of the upper surface of the cone 2 and the caliber of the feed port are the same. The ratio of the height of the pipe 5 to the height of the cone 2 can be 1: (0.9-1.5), preferably 1: (1-1.2).

[0031] In the flash evaporation equipment described in the present invention, in order to reduce the impact and wear of the material on the pipeline and the flash evaporation tank, a reinforcement ring 8 is preferably provided on the outer side of the connecting pipe 5 .

[0032] In the flash evaporation device of the present invention, the support tube 6 can be a round tube. The height of the support tube 6 is the same as the height of the cone 2.

[0033] In the flash evaporation equipment described in the present invention, the flange 7 is a conventional flange in the art.

[0034] In some embodiments, the feed port includes a cone 2 and a stirring device with spiral blades arranged inside the cone, the cone 2 is a truncated cone; a reinforcing rib plate 1 is arranged on the outside of the cone 2, the shape of the reinforcing rib plate 1 is a trapezoid, the number of the reinforcing rib plates 1 is 3-30, a support tube 6 is arranged on the central axis of the cone 2, the support tube 6 is a circular tube, an inclined guide plate 3 and a vertical guide plate 4 are arranged between the cone 2 and the support tube 6, the number of the inclined guide plates 3 is 3-30, the shape of the inclined guide plates 3 is a right-angle trapezoid or a fan, and the inclined guide plates 3 are perpendicular to the flash tank. The angle is 5-45°; the number of the vertical guide plates 4 is 3-30; the number of the reinforcing rib plates 1, the inclined guide plates 3 and the vertical guide plates 4 is equal and arranged at intervals, and are arranged with the central axis of the cone 2 as the center of symmetry, the angle between adjacent reinforcing rib plates 1 and the inclined guide plates 3 is 6-60°, the angle between adjacent reinforcing rib plates 1 and the vertical guide plates 4 is 6-60°, and the angle between adjacent inclined guide plates 3 and the vertical guide plates 4 is 6-60°; the flange 7 is connected to the top of the cone 2 through a connecting pipe 5, and the connecting pipe 5 is in the shape of a circular tube.

[0035] The present invention also provides a method for decarbonizing a carbonate solution, the method comprising: adding the carbonate solution that has absorbed carbon dioxide into the above-mentioned flash evaporation device for decarbonization. According to the method described in the present invention, through the flash evaporation device described in the present invention, the carbonate solution enters the flash evaporation tank through the feed port provided with vertical guide plates and inclined guide plates with special shapes and angles, dispersing part of the pressure to solve the problem of severe erosion of gas-liquid two phases due to excessive local pressure in the flash evaporation tank, reduce continuous impact on the equipment, eliminate vibration, and extend the service life of the equipment.

[0036] In the method of the present invention, the conditions of the decarburization treatment include: the temperature can be 200° C.-900° C.; the pressure can be 0.75 MPa±0.05 MPa. In this article, the pressure is gauge pressure.

[0037] In the method of the present invention, in order to reduce the wear on the flash tank, the method preferably further comprises: before adding the carbonate solution to the flash device, subjecting the carbonate solution to a decompression treatment.

[0038] In the method of the present invention, the flow rate of the carbonate solution in the flash evaporation device can be 1000-2000m 3 / h, for example, 1000m 3 / h、1200m 3 / h、1400m 3 / h、1600m 3 / h、1800m 3 / h or 2000m 3 / h. The carbonate solution may be a potassium carbonate aqueous solution and / or a sodium carbonate aqueous solution. The concentration of the carbonate solution may be between 20 mg / L and 200 mg / L. The decarbonization treatment utilizes the carbonate solution to react with carbon dioxide to form bicarbonate, thereby capturing and removing carbon dioxide.

[0039] The flash evaporation device and the decarbonization method of carbonate solution of the present invention are further described by examples. The examples are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following examples.

[0040] The experimental methods in the following examples, unless otherwise specified, are all conventional methods in the art. The experimental materials used in the following examples, unless otherwise specified, are all commercially available.

[0041] Example 1

[0042] The flash evaporation equipment comprises a flash evaporation tank with a width of 1000 mm and a feed port with a diameter of DN100 arranged at the top of the flash evaporation tank, wherein the feed port comprises a cone 2 and a stirring device with spiral blades arranged inside the cone, wherein the cone 2 is a truncated cone, and a reinforcing rib plate 1 is arranged on the outside of the cone 2, wherein the shape of the reinforcing rib plate 1 is a trapezoid, and the number of the reinforcing rib plates 1 is 3, and a support tube 6 is arranged on the central axis of the cone 2, wherein the support tube 6 is a circular tube, and an inclined guide plate 3 and a vertical guide plate 4 are arranged between the cone 2 and the support tube 6, wherein the number of the inclined guide plates 3 is 3, and the shape of the inclined guide plates 3 is a right-angled trapezoid, and the inclined guide plates 3 and the flash evaporation tank are connected to each other. The angle of the steam tank is 5°; the number of the vertical guide plates 4 is 3, and the shape of the vertical guide plates 4 is rectangular. The number of the reinforcing rib plates 1, the inclined guide plates 3 and the vertical guide plates 4 is equal and arranged at intervals, and are arranged with the central axis of the cone 2 as the center of symmetry. The angle between adjacent reinforcing rib plates 1 and the inclined guide plates 3 is 40°, the angle between adjacent reinforcing rib plates 1 and the vertical guide plates 4 is 60°, and the angle between adjacent inclined guide plates 3 and the vertical guide plates 4 is 20°; the flange 7 is connected to the top of the cone 2 through a connecting pipe 5, and the connecting pipe 5 is in the shape of a circular tube. A reinforcing ring 8 is preferably provided on the outside of the connecting pipe 5.

[0043] A sodium carbonate aqueous solution with a concentration of 100 mg / L was decompressed to a pressure of 0.75 MPa by a decompression pump, and then passed into the flash evaporation device in Example 3 at a flow rate of 1500 m3 / h for decarbonization treatment. The volume of carbon dioxide dissolved in the sodium carbonate aqueous solution was twice that of the sodium carbonate aqueous solution. The temperature of the decarbonization treatment was 145°C and the pressure was 0.75 MPa. The stirring speed of the stirring device was 1000 rpm. During the decarbonization treatment process, the flash evaporation device eliminated vibration and had no wear.

[0044] Example 3

[0045] The flash evaporation equipment comprises a flash evaporation tank with a width of 5000 mm and a feed port with a diameter of DN400 arranged at the top of the flash evaporation tank, wherein the feed port comprises a cone 2 and a stirring device with spiral blades arranged inside the cone, wherein the cone 2 is a truncated cone, and a reinforcing rib plate 1 is arranged on the outside of the cone 2, wherein the shape of the reinforcing rib plate 1 is a trapezoid, and the number of the reinforcing rib plates 1 is 3, and a support tube 6 is arranged on the central axis of the cone 2, wherein the support tube 6 is a circular tube, and an inclined guide plate 3 and a vertical guide plate 4 are arranged between the cone 2 and the support tube 6, wherein the number of the inclined guide plates 3 is 3, and the shape of the inclined guide plates 3 is a right-angled trapezoid, and the inclined guide plates 3 and the flash evaporation tank are connected to each other. The angle of the groove is 5°; + the number of the vertical guide plates 4 is 3, and the shape of the vertical guide plates 4 is rectangular. The number of the reinforcing rib plates 1, the inclined guide plates 3 and the vertical guide plates 4 is equal and arranged at intervals, and are arranged with the central axis of the cone 2 as the center of symmetry. The angle between adjacent reinforcing rib plates 1 and the inclined guide plates 3 is 45°, the angle between adjacent reinforcing rib plates 1 and the vertical guide plates 4 is 60°, and the angle between adjacent inclined guide plates 3 and the vertical guide plates 4 is 20°; the flange 7 is connected to the top of the cone 2 through a connecting pipe 5, and the connecting pipe 5 is in the shape of a circular tube. A reinforcing ring 8 is preferably provided on the outside of the connecting pipe 5.

[0046] The sodium carbonate aqueous solution with a concentration of 100 mg / L was decompressed to a pressure of 0.75 MPa by a pressure reducing pump and then pumped at a flow rate of 1500 m 3 / h is passed into the flash evaporation device in Example 3 for decarbonization treatment, the volume of carbon dioxide dissolved in the sodium carbonate aqueous solution is twice that of the sodium carbonate aqueous solution, the temperature of the decarbonization treatment is 148°C, and the pressure is 0.80MPa. The stirring speed of the stirring device is 1000 rpm. During the decarbonization process, the flash evaporation device eliminates vibration and has no wear.

[0047] Example 3

[0048] The flash evaporation equipment comprises a flash evaporation tank with a width of 7000 mm and a feed port with a diameter of DN300 arranged at the top of the flash evaporation tank, wherein the feed port comprises a cone 2 and a stirring device with spiral blades arranged inside the cone, wherein the cone 2 is a truncated cone, wherein a reinforcing rib plate 1 is arranged on the outside of the cone 2, wherein the shape of the reinforcing rib plate 1 is a trapezoid, wherein the number of the reinforcing rib plates 1 is 3, wherein a support tube 6 is arranged on the central axis of the cone 2, wherein the support tube 6 is a circular tube, wherein an inclined guide plate 3 and a vertical guide plate 4 are arranged between the cone 2 and the support tube 6, wherein the number of the inclined guide plates 3 is 3, wherein the shape of the inclined guide plates 3 is a right-angled trapezoid, wherein the inclined guide plates 3 and the flash evaporation tank are connected to each other. The angle of the steam tank is 5°; the number of the vertical guide plates 4 is 3, and the shape of the vertical guide plates 4 is rectangular. The number of the reinforcing rib plates 1, the inclined guide plates 3 and the vertical guide plates 4 is equal and arranged at intervals, and are arranged with the central axis of the cone 2 as the center of symmetry. The angle between adjacent reinforcing rib plates 1 and the inclined guide plates 3 is 50°, the angle between adjacent reinforcing rib plates 1 and the vertical guide plates 4 is 60°, and the angle between adjacent inclined guide plates 3 and the vertical guide plates 4 is 20°; the flange 7 is connected to the top of the cone 2 through a connecting pipe 5, and the connecting pipe 5 is in the shape of a circular tube. A reinforcing ring 8 is preferably provided on the outside of the connecting pipe 5.

[0049] The sodium carbonate aqueous solution with a concentration of 100 mg / L was decompressed to a pressure of 0.75 MPa by a pressure reducing pump and then pumped at a flow rate of 1500 m 3 / h is passed into the flash evaporation device in Example 3 for decarbonization treatment, the volume of carbon dioxide dissolved in the sodium carbonate aqueous solution is twice that of the sodium carbonate aqueous solution, the temperature of the decarbonization treatment is 146°C, and the pressure is 0.70MPa. The stirring speed of the stirring device is 1000 rpm. During the decarbonization treatment process, the flash evaporation device eliminates vibration and has no wear.

[0050] Comparative Example 1

[0051] A 100 mg / L potassium carbonate aqueous solution was decompressed to a pressure of 0.70 MPa by a pressure reducing pump and then pumped at a flow rate of 1000 m 3 / h is passed into the conventional flash evaporation equipment in the field for decarbonization treatment. The volume of carbon dioxide dissolved in the potassium carbonate aqueous solution is 3.15 times that of the potassium carbonate aqueous solution. The temperature of the decarbonization treatment is 145°C and the pressure is 0.12MPa. The pressure of the feed port is 0.10MPa, and the pressure of the gas and solution outlet after flash evaporation is 0.03MPa. During the decarbonization process, due to the decompression, the gas-liquid two-phase, the flow rate increases several times, which produces a huge impact force on the flash tank, the flash equipment vibrates severely, and is punctured on a large area many times, requiring welding of reinforcement plates.

[0052] It can be seen from the comparison between the embodiment and the comparative example that the embodiment of the flash evaporation device according to the present invention improves the vibration phenomenon and the flash evaporation device has no damage.

[0053] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A flash evaporation device, comprising a flash evaporation tank and a feed inlet arranged at the top of the flash evaporation tank, characterized in that: The feed port comprises a cone (2) and a stirring device with spiral blades arranged inside the cone, a reinforcing rib plate (1) is arranged on the outside of the cone (2), a support pipe (6) is arranged on the central axis of the cone (2), an inclined guide plate (3) and a vertical guide plate (4) are arranged between the cone (2) and the support pipe (6), and a flange (7) is connected to the top of the cone (2) through a connecting pipe (5).

2. The flash evaporation equipment according to claim 1, characterized in that: A reinforcing ring (8) is arranged on the outer side of the connecting pipe (5).

3. The flash evaporation equipment according to claim 1 or 2, characterized in that: The inclined guide plate (3) and the vertical guide plate (4) are arranged at intervals.

4. The flash evaporation equipment according to claim 1, characterized in that: The number of the inclined guide plates (3) is 3-30.

5. The flash evaporation equipment according to claim 4, characterized in that: The angle between the inclined guide plate (3) and the flash tank is 5-45°.

6. The flash evaporation equipment according to claim 1, characterized in that: The number of the vertical guide plates (4) is 3-30.

7. The flash evaporation equipment according to claim 1, characterized in that: The number of the reinforcing rib plates (1) is 3-30.

8. The flash evaporation equipment according to any one of claims 4 to 7, characterized in that: The reinforcing rib plates (1), the inclined guide plates (3) and the vertical guide plates (4) are equal in number and are arranged at intervals.

9. The flash evaporation equipment according to any one of claims 4 to 7, characterized in that: The shape of the inclined guide plate (3) is a right-angled trapezoid or a fan-shaped; and / or The vertical guide plate (4) is in the shape of a rectangle or a square.

10. A method for decarbonizing a carbonate solution, characterized in that: The method comprises: adding the carbonate solution that has absorbed carbon dioxide into the flash evaporation equipment described in any one of claims 1 to 9 for decarbonization treatment.

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